# Algorithm to Find the Area of a Circle

In this tutorial, we will learn how to write and develop an algorithm and flowchart to find the area of a circle of radius r. The problem to solve is to find the area of the circle.

The mathematical formula to compute the area of the circle is:

*area = pi*r*r*

## IPO chart

Let’s analyze the inputs and the expected outputs of the program.

Input, Process, and Output chart.

Input |
Process |
Output |

The radius of the circle(r) | Area = pi * r * r | Area of the circle(Area) |

**Algorithm**

Input: Radius r of the Circle.

Output: Area of the Circle

**Step 1**: Start**Step 2**: Read the radius r of the circle**Step 3**: Compute the Area as per the formula. PI*r*r**Step 4**: Print the area of the circle**Step 5**: Stop

## Pseudocode

The pseudocode for the algorithm is as follows:

```
START
DECLARE Real r
DECLARE Real area
OUTPUT "Enter the circle radius="
INPUT r
ASSIGN area = PI*r*r
OUTPUT "Area of the circle with radius " & r & " = " & area
END
```

## Flowchart

Let’s develop the flowchart for the given problem:

## Sample Run

Execute the flowchart and verify its output.

That’s it. We have successfully designed an algorithm & flowchart to compute the area of the given circle.

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**Flowgorithm Tutorials**

You can find tutorials for the Flowgorithm flowchart tool on this website at:

**Flowgorithm Website**

For more information, visit the official website of Flowgorithm.